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  1. #1

    Post Float Switch in Rooftop Unit

    I am curious to find out if anyone else has come across this issue. I have been doing HVAC work *both commercial and residential* for about 9 yrs now and have never come across the problem i did today. After installing two 5 ton rooftop units and getting the inspector to approve it, he came back saying that he could not pass it unless i had a float switch on both units. I have never had to install a float switch on a package unit before and i thought this was a little crazy. The job was in Ky, so i'm not sure if anyone in other states has any information on this or if this inspector was just being ridiculous. I do not know of any code that requires a rooftop package unit to have a float switch installed.

  2. #2
    Join Date
    Jun 2010
    Location
    North Fl
    Posts
    154
    You have to have them in FL..... They are getting ready to pass it so a mini split has to have a float switch.....
    HOW MUCH DID YOU SAY???

  3. #3
    Join Date
    Jan 2005
    Location
    where it's nice and warm
    Posts
    236
    It's required in my side of the world.Shure beats having soaking wet ducts smelling real refreshing.

  4. #4
    Join Date
    Sep 2002
    Location
    Hampton Roads, Virginia
    Posts
    1,557
    It's been in the IMC for a few years now, some states are only just moving into the relevant IMC code cycle for it to apply in that state.
    My question is, why if the IMC says that the condensate overflow device must be in the unit not external why does the manufacturer not fit it?


    Kevin
    "Profit is not the legitimate purpose of business. The legitimate purpose of business is to provide a product or service that people need and do it so well that it's profitable."

    James Rouse

  5. #5
    Thank you for the posts. I guess this could be something that is going to start happening more. I have done jobs all over the east coast and never had to do that but i guess i will need to start asking about that.

  6. #6
    Join Date
    Sep 2008
    Location
    Western PA
    Posts
    24,998

  7. #7
    Join Date
    Feb 2012
    Location
    Upstate SC
    Posts
    84
    Unless it is local code I think the inspector has told you wrong. In most cases though it easier to comply with what they want and move on to the next job.

  8. #8
    Join Date
    Jul 2011
    Location
    East coast USA
    Posts
    925
    Quote Originally Posted by jburchstead View Post
    Unless it is local code I think the inspector has told you wrong. In most cases though it easier to comply with what they want and move on to the next job.
    AMEN, I have not heard of this before, but it comes down to the inspector. I would nicely ..Niiiiicely..ask show me the code. They are human of course. But it wouldn't surprise me. In some places they will not let you to drain condensate off on the roof or in the storm drains. it has to be piped to the sewer. It amazes me, Man makes the rules and than wonders why the cost of stuff keeps rising.


  9. #9
    Join Date
    Aug 2007
    Location
    Northern VA 38 degrees N by 76 degrees W
    Posts
    5,046
    Quote Originally Posted by dlove View Post
    AMEN, I have not heard of this before, but it comes down to the inspector. I would nicely ..Niiiiicely..ask show me the code. They are human of course. But it wouldn't surprise me. In some places they will not let you to drain condensate off on the roof or in the storm drains. it has to be piped to the sewer. It amazes me, Man makes the rules and than wonders why the cost of stuff keeps rising.

    IMC 307.2.3.1

  10. #10
    Join Date
    Jul 2011
    Location
    East coast USA
    Posts
    925
    Quote Originally Posted by second opinion View Post
    IMC 307.2.3.1
    All i can say great Idea! this should be a factory design issue. either way not a big deal

  11. #11
    Join Date
    Jul 2002
    Location
    SE Texas
    Posts
    435
    If it's a downflow, yes, we are required to install a float. On side discharge, no. The IMC is ambiguous:

    "On downflow units and all other coils that do not have a secondary drain or provisions to install a secondary or auxiliary drain pan, a water-level monitoring device shall be installed inside the primary drain pan. This device shall shut off the equipment served in the event that the primary drain becomes restricted. Devices installed in the drain line shall not be permitted"

    Some believe, since the code specifically addresses downflow units, that eliminates a requirement for side discharge units to have a float. It's all in the interpretation. However, having said that, it's best not to argue with the local inspectors.

  12. #12
    Join Date
    Dec 2011
    Location
    bedford ind
    Posts
    1,085
    Don't require them in this part of indiana, they do in Louisville. I've seen them on upflow furnaces in basements, in louisville.

  13. #13
    Join Date
    Jun 2006
    Location
    New Jersey
    Posts
    4,291
    Quote Originally Posted by SandShark View Post
    If it's a downflow, yes, we are required to install a float. On side discharge, no. The IMC is ambiguous:

    "On downflow units and all other coils that do not have a secondary drain or provisions to install a secondary or auxiliary drain pan, a water-level monitoring device shall be installed inside the primary drain pan. This device shall shut off the equipment served in the event that the primary drain becomes restricted. Devices installed in the drain line shall not be permitted"

    Some believe, since the code specifically addresses downflow units, that eliminates a requirement for side discharge units to have a float. It's all in the interpretation. However, having said that, it's best not to argue with the local inspectors.
    How is that even accomplished on the smaller RTU's?

    Alot of the pans are just as wide as the coil and tight against them.

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